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The effect of a magnetic field on the spectral density of a S0ex{0ex}=0ex{0ex}1/2 Kondo impurity is investigated at zero and finite temperatures by using Wilson's numerical renormalization group method. A splitting of the total spectral density is found for fields larger than a critical value H₂ (T0ex{0ex}=0ex{0ex}0) 0. 5T₊, where T₊ is the Kondo scale. The splitting correlates with a peak in the magnetoresistivity of dilute magnetic alloys which we calculate and compare with the experiments on CeₗLa₁-ₗAl₂, x0ex{0ex}=0ex{0ex}0. 0063. The linear magnetoconductance of quantum dots exhibiting the Kondo effect is also calculated.
T. A. Costi (Mon,) studied this question.